<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!--引用外部链接中的样式-->
    <style>
        div{
            color:blue;
            font-size:80px;
           border:red 8px double;
        }
    </style>
    <link rel="stylesheet" href="demo.css">
</head>
<body>
    <!-- <div style="color :aquamarine;font-size: 40px;"> -->
    <div>
        样式表优先级!<br>
        就近原则！
    </div>
</body>
</html>